java_sdk_library: Path extraction from deps depend on tag

Previously, the information that the java_sdk_library extracted from
its child dependencies was determined purely by the type of the
dependency and whether it had a tag of the appropriate type. The actual
tag itself was ignored. That worked but was a little fragile as it
relied on there being no overlap between the types of the dependencies
or if there was overlap on the order in which the dependencies were
processed and the dependency types were checked to ensure that the
correct information was collected.

This change makes the information that is extracted dependent on the
tag that is used. That makes the behavior much more robust and also
simplifes the follow up change which may get the stubs source and API
files from separate droidstubs invocations.

Changes:
* A func field is added to the scopeDependencyTag that is supplied with
  a dependency from which to extract the information and scopePaths
  into which the information will be stored.
* Each scopeDependencyTag instance supplies its own function.
* Various items are renamed to more closely reflect what they actually
  do. e.g. the apiFileTag is renamed to stubsSourceAndApiTag field
  because if provides access to both api file and stubs source.

Test: m checkapi
Bug: 155164730
Merged-In: I4e1861ea67f441f2948a0d7d7053ab0b1169955f
Change-Id: I4e1861ea67f441f2948a0d7d7053ab0b1169955f
(cherry picked from commit c878250d)